1. Ear Nose Throat Department, Hospital Universitari de la Vall d’Hebron, Barcelona, Spain
2. Department of Otolaryngology, Washington University in St Louis, St Louis, Missouri, USA
3. Department of Otolaryngology, Harvard Medical School, Boston, Massachusetts, USA
4. Department of Otolaryngology, SUNY Downstate Medical Center, Brooklyn, New York, USA
5. Pomona Pediatrics, Pomona, New York, USA